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Semaphore UI

Support level: Community

What is Semaphore UI​

Semaphore UI is a modern web interface for managing popular DevOps tools.

-- https://semaphoreui.com/

This guide explains how to configure Semaphore UI to use authentik as the OAuth provider for logging in to the Web GUI.

Preparation​

The following placeholders are used in this guide:

  • semaphore.company is the FQDN of the Semaphore installation.
  • authentik.company is the FQDN of the authentik installation.

authentik configuration​

Start the wizard for adding a new application.

1. Application:

  • Name: Semaphore UI
  • Slug: semaphore

2. Choose a Provider

Select OAuth2/OpenID Provider

3. Configure Provider

Select implicit or explicit authorization flow as desired.

Take note of the Client ID and Client Secret, you'll need to give them to Semaphore UI later.

  • Redirect URIs/Origins (RegEx): https://semaphore.company/api/auth/oidc/authentik/redirect/
  • Signing Key: authentik Self-signed Certificate

Leave the rest as default values.

Semaphore UI configuration​

Log in to your Semaphore UI host via SSH. Edit the /etc/semaphore/config.json file with the text editor of your choice.

Add the oidc_providers configuration:

{
  "oidc_providers": {
    "authentik": {
      "display_name": "Sign in with Authentik",
      "provider_url": "https://authentik.company/application/o/<slug>/",
      "client_id": "<client-id>",
      "client_secret": "<client-secret>",
      "redirect_url": "https://semaphore.company/api/auth/oidc/authentik/redirect/",
      "username_claim": "username",
      "name_claim": "name",
      "email_claim": "email",
      "scopes": ["openid", "profile", "email"]
  },
  ...
}
info

The name of the oidc_provider (e.g. authentik) needs to match the name on the redirect URL.

info

If a Not Found error is displayed after the login, you might need to set the web_root to / (see https://github.com/semaphoreui/semaphore/issues/2681):

SEMAPHORE_WEB_ROOT: /

More information on this can be found in the Semaphore documentation https://docs.semaphoreui.com/administration-guide/openid/authentik/.

Leave the rest as default.

Test the login​

  • Open a browser of your choice and open the URL https://semaphore.company.
  • Click on the SSO-Login button.
  • You should be redirected to authentik (with the login flows you created) and then authentik should redirect you back to https://semaphore.company URL.
  • If you are redirected back to the https://semaphore.company URL you did everything correct.
info

Users are created upon logging in with authentik. They will not have the rights to create anything initially. These permissions must be assigned later by the local admin created during the first login to the Semaphore UI.